22
Rev: 05-15/12
‘Automatic adjustment’ (Autotuning) function
The control panel features a programme that automatically finds the optimum PID settings for the connected load.
For this programme to work, it is important that the regulator is ready for operation, the load is connected and that a
non-critical temperature set value has already been set. In the ‘Loc’ menu (page 20), the value 0 must be set.
When in autotuning mode, the regulator moves through one or more control cycles so that it can establish the
parameters. This can result in considerable deviations from the set value. Bear this in mind when specifying
the set value. In consideration of this, it should be as close as possible to the actual control value.
During normal operation when a load is connected, press the button
for about 4 seconds.
In the SV display, the set value flashes in alternation with - AT -.
The procedure is complete once SV has
automatically returned to normal display.
In order to cancel autotuning, press the button again for about 4
seconds, until SV stops flashing. The
previous settings are not changed.
Alarm output configuration:
As well as an SSR output, the TR-81 also features an alarm output (terminals 8, 7, 6), which can be provided with its
own set value (Menu B, parameter AL1T) as well as its own hysteresis (Menu B, parameter DFAL). When making
any such settings, refer to the information provided in menu table B, under parameter point ALT1.
If, when the regulator is switched on, an undesired alarm is emitted (when the set value at the time of switching on
corresponds to the alarm value), this can be prevented by the HJB setting (if the alarm range is higher than the set
value) or the LJB setting (if the alarm range is below the set value). Both these settings can be found in menu AL1T.
These settings enable the alarm to be temporarily bypassed after the control voltage has been switched on.
Maintenance and customer service:
In normal operation, the TR-81 regulator does not require maintenance. Excessive dust deposits should however be
avoided. Use in wet rooms is only permitted with the approved housing with protective cover (part no Z-45-
KsKap45x45). Electronic components must be protected against condensation moisture.
Dirt on the front and on the housing can be removed with a slightly moistened cloth when the regulator is switched
off.
Error code:
HHHH
Measurement signal is above the expected range!
If displayed after sensor installation: Wrong sensor type set in the ‘Sn’ parameter (Menu table B).
Temperature measured is outside the upper and lower set value range (‘inPL’ and ‘inPH’, page 21).
Load is switched off.
LLLL
Measurement signal is below the expected range!
If displayed after sensor installation: Wrong sensor type set in the ‘Sn’ parameter (Menu table B).
Temperature measured is outside the upper and lower set value range (‘inPL’ and ‘inPH’, page 21).
Load is switched off.
We reserve the right to amend the technical specifications.
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